SERVICE INFORMATION
SRM-5000
8
2-3 Adjusting carburettor
1. Start engine and warm it up well as follows.
(1) Warm engine up for approx. 1 minute at idle
speed.
(2) Warm it up alternating engine speed between
half-throttle speed (Partial speed approx. 6,000
r/min with nylon line head, 7,000 r/min with metal
blade) and idle speed every 2 seconds for 2 minutes.
(3) Turn H mixture needle anticlockwise until engine
speed drops to approx. 9,000 r/min (When using
metal blade : 9,500 r/min) at WOT.
(4) Warm it up alternating 3 times of engine speed
between WOT for 1 minute and idling for 10 seconds.
2. Verify idle engine speed and adjust idle speed as
follows.
(1) Verify idle engine speed. When the speed is in
the range of 2,300 to 2,600 r/min, proceed to step 3.
(2) If the speed is not in this range, adjust idle mixture
needle (C) to reach maximum idle speed with 2.5
mm blade screw driver.
(3) Set idle speed to the range of 3,300 to 3,500
r/min by turning idle adjust screw (D).
(4) Turn idle mixture needle (C) anticlockwise to
reduce idle speed 900 to 1,000 r/min in the range of
2,300 to 2,600 r/min.
NOTE : Engine speed must be allowed to stabilize
minimum of 20 seconds after each adjustment to
assure accurate tachometer readings.
3. Adjust WOT engine speed as follows.
(1) Before adjusting carburettor, WOT engine speed
should be less than or equal to 9,000 r/min (When
using metal blade : 9,500 r/min). If engine speed is
higher than 9,000 r/min (When using metal blade :
9,500 r/min), turn H mixture needle (F) anticlockwise
at WOT to reduce the engine speed.
(2) Turn H mixture needle clockwise to obtain 9,900
to 10,100 r/min at WOT (When using metal blade :
10,800 - 11,200 r/min).
(3) Run engine alternating 4 times of engine speed
between WOT for 30 seconds and idling 5 seconds.
Then confirm WOT engine speed if in the range of
9,900 to 10,200 r/min (When using metal blade :
10,500 - 11,500 r/min). When engine dose not run
in this range, adjust H mixture needle again until
engine runs within 9,800 - 10,200 r/min (When using
metal blade : 10,500 - 11,500 r/min).
(C)
(D)
(F)
